## MONTE CARLO CALCULATED RESPONSE OF THE DUAL THIN SCINTILLATION DETECTOR IN THE SUM COINCIDENCE MODENational Bureau of Standards, Gaithersburg, MD 20899, USAThe Dual Thin Scintillator (DTS) is a unique neutron detector that is being developed for improved fluence and spectrum measurement. Current attention has been directed towards understanding some details of the detector response in the sum coincidence mode of operation where a peaked pulse-height response is exhibited throughout the energy region of interest. As a result of the peaked distribution, the detector efficiency is a weak function of the pulse-height bias, allowing the number of recorded events above the bias to be determined with greater certainty. A Monte Carlo code has been used to calculate the sum coincidence pulse-height response at several energies within the 1 to 15 MeV region. The detector efficiency as a function of neutron energy has also been calculated. The results of the Monte Carlo calculations, which include the effect of multiple scattering on the shape of the response function and efficiency curve are presented. KEYWORDS: detector, efficiency, neutron, proton recoil, response function, scintillation |